I have no idea whether the stories you hear about South African townships are true or not, but apparently these are some of the most dangerous places on earth and tourists are not to go there on their own.
There are many townships in and around Cape Town, most of them in the area south-east of the center called Cape Flats.
Having said that, visiting a township in South Africa is a must for tourists. It's important to see and understand that South Africa is not just Camps Bay and the Garden Route, just make sure to have trustworthy local guidance and don't visit on your own!
There is this chemical plant or something just beside the highway when you enter the city from east ( from Somerset West), and when you drive by it it really stinks even if you close all your windows.I dont know what kind of idiot decided to place that thing at the entrance of the city. stinky welcome, huh